Washington (CNN) President Donald Trump told reporters Thursday that South Korea will make a "major announcement" concerning North Korea at 7 p.m. ET.

It was not immediately clear what the South Korean announcement would entail, but it came after a South Korean delegation came to the White House to brief officials on its most recent talks with North Korea -- the most significant talks between the two countries in more than a decade.

Trump has expressed an openness to dialogue with North Korea, but the Trump administration has said North Korea must first take concrete steps toward denuclearization.

"All options are on the table and our posture toward the regime will not change until we see credible moves toward denuclearization," a senior administration official told reporters on Tuesday. "What we are looking for is concrete steps toward denuclearization."

Trump's approach to North Korea has wavered between bellicose rhetoric and ..read more at CNN